J. Faiz - Academia.edu (original) (raw)
Papers by J. Faiz
2017 IEEE International Electric Machines and Drives Conference (IEMDC), 2017
This paper investigates the effect of the rotor slots (bars) number of a three phase squirrel cag... more This paper investigates the effect of the rotor slots (bars) number of a three phase squirrel cage induction motor on the motor performance under broken bar fault condition. Two motors have been investigated at full load condition in healthy bars, one broken bar and two broken bars operations. The first motor has 24 stator slots and is investigated with rotor slots 20, 29 and 32 and the second motor has 36 slots and is investigated with rotor slots 28 and 44. The above-mentioned rotor slots numbers have been selected based on manufacturer's database. The effect of rotor slots numbers on motor performance with broken bars fault has been observed by analyzing the stator current emerging frequency components, steady state copper losses, slip at full load and steady state bar currents. Recommendation for the safest stator and rotor slots combinations has been provided based on simulated key performance indicators.
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This paper presents a novel analytical method for estimation of the flux densities waveforms in v... more This paper presents a novel analytical method for estimation of the flux densities waveforms in various sections of 8/6 Switched Reluctance Motors (SRMs). For this, finite element analysis (FEA) of an 8/6 SRM is carried out to, i) identify flux tube paths in the motor in different rotor positions, ii) implement the analytical flux tube method, and iii) calculate the flux linkage and inductance characteristics of the motor. Inductance characteristic is then incorporated into the voltage equation of the stator winding to obtain dynamic excitation current waveform. It means that model of the motor is formed via non-linear Ampere’s law equation that drives for each flux tube in three regions. The results obtained by the proposed analytical and finite element methods are compared and good agreements are achieved.
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Journal of Power Electronics, 2011
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COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2016
Purpose – Electrical energy distribution systems must be low losses systems in order to enhance t... more Purpose – Electrical energy distribution systems must be low losses systems in order to enhance the system efficiency. Therefore, it is preferred to distribute electrical energy by bus-ducts in the place of cables over all energy levels and decrease the losses. The purpose of this paper is to focus on a comprehensive survey of various aspects of bus-ducts design including electromagnetic, mechanical and thermal. Advantages and disadvantages of different available design techniques are reviewed. Design/methodology/approach – Different works on various bus-based power transmission and distribution systems are reviewed. Generally these are done in three categories including systems modeling methods, heat transfer in the systems, short circuit and electromagnetic force. The attempt is made to provide geometrical and materials specifications in order to present the analyzed system well. Findings – Different types of bus-ducts from used materials, voltage level and insulation types are re...
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ABSTRACT In this paper, a novel analytical approach is proposed to calculate ohmic and core losse... more ABSTRACT In this paper, a novel analytical approach is proposed to calculate ohmic and core losses in induction motors under breakage of the rotor bars. In order to precise loss computation, the non-sinusoidal characteristics of the distorted magnetic flux density and unbalanced stator currents due to the breakage bars are taken into account. Hence, new coefficients are defined and determined analytically to achieve new formula for ohmic and core losses estimation. Furthermore, considerable effects of inverter harmonics on the stator currents and magnetic flux density in the inverter-fed induction motor are reckoned for precise loss calculation in this case. Impacts of the different controlling strategies on the proposed approach are studied from different aspects. The necessary parameters and signals are simulated using modified winding function method as an analytical modeling method. The obtained results via proposed approach are verified by the finite element method and experimental results.
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Fourth IEEE Region 10 International Conference TENCON
Two sample calculations for finite slot depth performed using the assumed flux paths method have ... more Two sample calculations for finite slot depth performed using the assumed flux paths method have been carried out and it has been found that the estimated correction factors are overestimated for d/s above 0.5 and underestimated for d/s below 0.4 (in comparison with the finite element computation). The maximum and minimum difference between the two calculated values are 3.6% and 1%, respectively. Considering the approximate nature of the assumed flux paths method the combined procedure used for this calculation shows good agreement with finite element computation and the result can be used at least for handy reference.<<ETX>>
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Theprimary roleofanautomatic voltage regulator (AVR)istoregulate thereactive powerandvoltage magn... more Theprimary roleofanautomatic voltage regulator (AVR)istoregulate thereactive powerandvoltage magnitude. Thesystem modeled consists oftheamplifier, exciter, sensor and stabilizer orproportional-integral-derivative (PID)controller. Thestate-space technique isusedtomodelthesystem. Their characteristics andbehavior arealsobriefly discussed. Results of thesimulation studies ontheAVR system using Matlabareprese- nted.By examining theparameters ofthestabilizer and controller, thegenerator terminal voltage variations are predicted. I.INTRODUCTION Thereactive powerisoneofimportant factors forexploitati- onanddesigning inthepowersystem. Thebalance ofreactive powerinthesystem implies constant output voltage. Themost commonstrategies forthereactive powerandvoltage control canbeclassified asinjection ofreactive powerbyshunt com- pensator, displacement ofreactive powerinthesystem bytap changing transformers andreducing inductive reactance ofthe lines by series capacitor. TheAVR systems areused ex...
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2015 IEEE 5th International Conference on Power Engineering, Energy and Electrical Drives (POWERENG), 2015
Induction machines are widely used in different applications. Unpredicted breakdown of these mach... more Induction machines are widely used in different applications. Unpredicted breakdown of these machines usually leads to costly downtime and repairs. These expenses can be minimized by using proper condition monitoring techniques. Eccentricity fault is one of the widespread faults causing machine malfunction; its detection could be useful for preventing of harmful consequences. In this paper, different works on eccentricity fault diagnosis of induction machines with different types of supply have been reviewed. Due to extensive use of induction machines in wind turbines (WT) as doubly-fed induction generator (DFIG), in addition to declaration of importance of eccentricity fault diagnosis in DFIG, detection of eccentricity fault in DFIG is also reviewed.
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AbstractRotor broken bars and static eccentricity faults, called mixed faults, are common faults... more AbstractRotor broken bars and static eccentricity faults, called mixed faults, are common faults in three-phase squirrel-cage induction motors. Many works have been so far reported on the analysis and diagnosis of these faults using analytical methods, only there are few papers ...
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20th Australasian Universities Power Engineering Conference (AUPEC 2010), 2010
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2017 IEEE International Electric Machines and Drives Conference (IEMDC), 2017
This paper investigates the effect of the rotor slots (bars) number of a three phase squirrel cag... more This paper investigates the effect of the rotor slots (bars) number of a three phase squirrel cage induction motor on the motor performance under broken bar fault condition. Two motors have been investigated at full load condition in healthy bars, one broken bar and two broken bars operations. The first motor has 24 stator slots and is investigated with rotor slots 20, 29 and 32 and the second motor has 36 slots and is investigated with rotor slots 28 and 44. The above-mentioned rotor slots numbers have been selected based on manufacturer's database. The effect of rotor slots numbers on motor performance with broken bars fault has been observed by analyzing the stator current emerging frequency components, steady state copper losses, slip at full load and steady state bar currents. Recommendation for the safest stator and rotor slots combinations has been provided based on simulated key performance indicators.
Bookmarks Related papers MentionsView impact
This paper presents a novel analytical method for estimation of the flux densities waveforms in v... more This paper presents a novel analytical method for estimation of the flux densities waveforms in various sections of 8/6 Switched Reluctance Motors (SRMs). For this, finite element analysis (FEA) of an 8/6 SRM is carried out to, i) identify flux tube paths in the motor in different rotor positions, ii) implement the analytical flux tube method, and iii) calculate the flux linkage and inductance characteristics of the motor. Inductance characteristic is then incorporated into the voltage equation of the stator winding to obtain dynamic excitation current waveform. It means that model of the motor is formed via non-linear Ampere’s law equation that drives for each flux tube in three regions. The results obtained by the proposed analytical and finite element methods are compared and good agreements are achieved.
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Journal of Power Electronics, 2011
Bookmarks Related papers MentionsView impact
COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2016
Purpose – Electrical energy distribution systems must be low losses systems in order to enhance t... more Purpose – Electrical energy distribution systems must be low losses systems in order to enhance the system efficiency. Therefore, it is preferred to distribute electrical energy by bus-ducts in the place of cables over all energy levels and decrease the losses. The purpose of this paper is to focus on a comprehensive survey of various aspects of bus-ducts design including electromagnetic, mechanical and thermal. Advantages and disadvantages of different available design techniques are reviewed. Design/methodology/approach – Different works on various bus-based power transmission and distribution systems are reviewed. Generally these are done in three categories including systems modeling methods, heat transfer in the systems, short circuit and electromagnetic force. The attempt is made to provide geometrical and materials specifications in order to present the analyzed system well. Findings – Different types of bus-ducts from used materials, voltage level and insulation types are re...
Bookmarks Related papers MentionsView impact
ABSTRACT In this paper, a novel analytical approach is proposed to calculate ohmic and core losse... more ABSTRACT In this paper, a novel analytical approach is proposed to calculate ohmic and core losses in induction motors under breakage of the rotor bars. In order to precise loss computation, the non-sinusoidal characteristics of the distorted magnetic flux density and unbalanced stator currents due to the breakage bars are taken into account. Hence, new coefficients are defined and determined analytically to achieve new formula for ohmic and core losses estimation. Furthermore, considerable effects of inverter harmonics on the stator currents and magnetic flux density in the inverter-fed induction motor are reckoned for precise loss calculation in this case. Impacts of the different controlling strategies on the proposed approach are studied from different aspects. The necessary parameters and signals are simulated using modified winding function method as an analytical modeling method. The obtained results via proposed approach are verified by the finite element method and experimental results.
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Fourth IEEE Region 10 International Conference TENCON
Two sample calculations for finite slot depth performed using the assumed flux paths method have ... more Two sample calculations for finite slot depth performed using the assumed flux paths method have been carried out and it has been found that the estimated correction factors are overestimated for d/s above 0.5 and underestimated for d/s below 0.4 (in comparison with the finite element computation). The maximum and minimum difference between the two calculated values are 3.6% and 1%, respectively. Considering the approximate nature of the assumed flux paths method the combined procedure used for this calculation shows good agreement with finite element computation and the result can be used at least for handy reference.<<ETX>>
Bookmarks Related papers MentionsView impact
Theprimary roleofanautomatic voltage regulator (AVR)istoregulate thereactive powerandvoltage magn... more Theprimary roleofanautomatic voltage regulator (AVR)istoregulate thereactive powerandvoltage magnitude. Thesystem modeled consists oftheamplifier, exciter, sensor and stabilizer orproportional-integral-derivative (PID)controller. Thestate-space technique isusedtomodelthesystem. Their characteristics andbehavior arealsobriefly discussed. Results of thesimulation studies ontheAVR system using Matlabareprese- nted.By examining theparameters ofthestabilizer and controller, thegenerator terminal voltage variations are predicted. I.INTRODUCTION Thereactive powerisoneofimportant factors forexploitati- onanddesigning inthepowersystem. Thebalance ofreactive powerinthesystem implies constant output voltage. Themost commonstrategies forthereactive powerandvoltage control canbeclassified asinjection ofreactive powerbyshunt com- pensator, displacement ofreactive powerinthesystem bytap changing transformers andreducing inductive reactance ofthe lines by series capacitor. TheAVR systems areused ex...
Bookmarks Related papers MentionsView impact
2015 IEEE 5th International Conference on Power Engineering, Energy and Electrical Drives (POWERENG), 2015
Induction machines are widely used in different applications. Unpredicted breakdown of these mach... more Induction machines are widely used in different applications. Unpredicted breakdown of these machines usually leads to costly downtime and repairs. These expenses can be minimized by using proper condition monitoring techniques. Eccentricity fault is one of the widespread faults causing machine malfunction; its detection could be useful for preventing of harmful consequences. In this paper, different works on eccentricity fault diagnosis of induction machines with different types of supply have been reviewed. Due to extensive use of induction machines in wind turbines (WT) as doubly-fed induction generator (DFIG), in addition to declaration of importance of eccentricity fault diagnosis in DFIG, detection of eccentricity fault in DFIG is also reviewed.
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
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AbstractRotor broken bars and static eccentricity faults, called mixed faults, are common faults... more AbstractRotor broken bars and static eccentricity faults, called mixed faults, are common faults in three-phase squirrel-cage induction motors. Many works have been so far reported on the analysis and diagnosis of these faults using analytical methods, only there are few papers ...
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
20th Australasian Universities Power Engineering Conference (AUPEC 2010), 2010
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Electromagnetics, Jan 1, 2004
The aim of this paper is first calculating the airgap magnetic permeance in a mixed eccentricity ... more The aim of this paper is first calculating the airgap magnetic permeance in a mixed eccentricity condition. This is done by studying the governing geometric conditions of the airgap. A novel and precise distribution of the airgap permeance is introduced and compared with those available in the literature. Moreover, by reviewing and extending the winding function theory for a nonuniform airgap, the general equations for evaluating the inductances of a three-phase squirrel-cage induction motor with a mixed eccentricity condition is presented. Various inductances of the motor are then calculated using the airgap permeance distribution and inductance equations, which lead to precise and closed form analytical expressions. In this calculation, skewing of the rotor bars is taken into account. Finally, the performance of a three-phase squirrel-cage induction motor with a mixed eccentricity is simulated and analyzed.
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